moving to OpenCVLoader API

Author: Andrey Pavlenko

samples/android/face-detection/jni/Android.mk

@@ -16,6 +16,6 @@ LOCAL_SRC_FILES  := DetectionBasedTracker_jni.cpp
 LOCAL_C_INCLUDES += $(LOCAL_PATH)
 LOCAL_LDLIBS +=  -llog -ldl
 
-LOCAL_MODULE     := detection_based_tacker
+LOCAL_MODULE     := detection_based_tracker
 
 include $(BUILD_SHARED_LIBRARY)

samples/android/face-detection/src/org/opencv/samples/fd/FdActivity.java

@@ -1,5 +1,9 @@
 package org.opencv.samples.fd;
 
+import org.opencv.android.BaseLoaderCallback;
+import org.opencv.android.LoaderCallbackInterface;
+import org.opencv.android.OpenCVLoader;
+
 import android.app.Activity;
 import android.app.AlertDialog;
 import android.content.DialogInterface;
@@ -18,8 +22,47 @@ public class FdActivity extends Activity {
     private MenuItem            mItemFace20;
     private MenuItem            mItemType;
 
-    private FdView				mView;
+    private FdView		mView;
 
+    private BaseLoaderCallback  mOpenCVCallBack = new BaseLoaderCallback(this) {
+    	@Override
+    	public void onManagerConnected(int status) {
+    		switch (status) {
+				case LoaderCallbackInterface.SUCCESS:
+				{
+					Log.i(TAG, "OpenCV loaded successfully");
+					
+					// Load native libs after OpenCV initialization
+					System.loadLibrary("detection_based_tracker");
+
+					// Create and set View
+					mView = new FdView(mAppContext);
+					mView.setDetectorType(mDetectorType);
+					mView.setMinFaceSize(0.2f);
+					setContentView(mView);
+					// Check native OpenCV camera
+					if( !mView.openCamera() ) {
+						AlertDialog ad = new AlertDialog.Builder(mAppContext).create();
+						ad.setCancelable(false); // This blocks the 'BACK' button
+						ad.setMessage("Fatal error: can't open camera!");
+						ad.setButton("OK", new DialogInterface.OnClickListener() {
+						    public void onClick(DialogInterface dialog, int which) {
+							dialog.dismiss();
+							finish();
+						    }
+						});
+						ad.show();
+					}
+				} break;
+				default:
+				{
+					super.onManagerConnected(status);
+				} break;
+			}
+    	}
+    };
+
+
     private int                 mDetectorType = 0;
     private String[]            mDetectorName; 
 
@@ -30,18 +73,19 @@ public FdActivity() {
         mDetectorName[FdView.NATIVE_DETECTOR] = "Native (tracking)";
     }
 
-    @Override
+	@Override
 	protected void onPause() {
         Log.i(TAG, "onPause");
 		super.onPause();
-		mView.releaseCamera();
+		if (mView != null)
+			mView.releaseCamera();
 	}
 
 	@Override
 	protected void onResume() {
         Log.i(TAG, "onResume");
 		super.onResume();
-		if( !mView.openCamera() ) {
+		if( mView != null && !mView.openCamera() ) {
 			AlertDialog ad = new AlertDialog.Builder(this).create();  
 			ad.setCancelable(false); // This blocks the 'BACK' button  
 			ad.setMessage("Fatal error: can't open camera!");  
@@ -61,10 +105,13 @@ public void onCreate(Bundle savedInstanceState) {
         Log.i(TAG, "onCreate");
         super.onCreate(savedInstanceState);
         requestWindowFeature(Window.FEATURE_NO_TITLE);
-        mView = new FdView(this);
-        mView.setDetectorType(mDetectorType);
-        mView.setMinFaceSize(0.2f);
-        setContentView(mView);
+
+        Log.i(TAG, "Trying to load OpenCV library");
+        if (!OpenCVLoader.initAsync(OpenCVLoader.OPEN_CV_VERSION_2_4_0, this, mOpenCVCallBack))
+        {
+        	Log.e(TAG, "Cannot connect to OpenCV Manager");
+        	finish();
+        }
     }
 
     @Override